This is not a monograph where composition logic, completeness of coverage and depth of study are required. The genre of essays allows you to touch on a variety of topics and consider them in different ways too; fragmentation of the topic is combined with looseness in the choice of form. The book contains articles with the results of extensive research on the history of individual methods of analysis, but you can also find cursory sketches on historical topics. A lot is devoted to people doing science. Who is interested in the book? Yes, to everyone who is somehow connected with the history of science, with chemistry in general and with analytical chemistry in particular.